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What kind of gas milage do you guys get for these kind of swaps, and what level of mods have you done for that milage? I was also curious about the octane level that you're using. Can you just take a ver7/8, drop it in, and run on 93 or 94, or does it need a reflash right away to take the lower octane?

My ver8 swap is getting about 350 km to a tank of gas. I use 94 or 92 octane most of the time, and its not reflashed. Running a stock jdm v8 ecu. It runs fine, but I would like to flash it to a lower octane like 92 which I can get everywhere here.

If mileage is a primary concern don't even think about doing the swap.

I have a ver 7 running 565cc pinks and 10psi and it gets about 24mpg hwy and about14-16mpg city (stop-and-go with boosty, agressive starts). 14 gallon tank gets 320 miles hwy. City driving, about 200. Never been flashed or tuned... running 92 for a year with no probs.

Milage really wasn't a concern, I was just curious. I had figured it would be close to the USDM STI but wasn't sure. That's interesting that you can the JDM ECU and still run US 92-94 octane, good enough for me!!

Kreeger,

Why are you only hitting 10psi? I thought the ver 7 had a turbo that was comparable to the VF34.

I detuned mine to only run 14psi and be able to beat the snot out of it on 91oct. I wouldn't be feeling so secure about that without the reflash. Just a little food for thought. But yes, the JDM ecu seems to adjust just fine to out urine blended gas.